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Associate II
October 24, 2025
Solved

Disabling M4 core through CubeProgrammer on Nucleo STM32H755ZIQ: It takes too long

  • October 24, 2025
  • 1 reply
  • 135 views

Hello all, I disabled the M4 core based on the tutorial by ST Employee mEALLEm, I pressed Apply, saw the option byte successfully programmed notification, but I have been waiting for MCU disconnect notification for 20 minutes now. The LD4 keeps blinking greed and red. Is there something I am missing because it should not be this long ? 

Thank you

Best answer by mkel

Hey folks just press reset on your Nucleo. The reset button press is mandatory for uplaod changes like code and this. Thank you for reading

1 reply

mkelAuthorBest answer
Associate II
October 24, 2025

Hey folks just press reset on your Nucleo. The reset button press is mandatory for uplaod changes like code and this. Thank you for reading